Remove wpilibj tests from wpilibjIntegrationTests (#1323)

Since the integration tests are still on junit 4, the wpilibj junit 5 tests fail.

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/MockSpeedController.java

@@ -0,0 +1,48 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017-2018 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package edu.wpi.first.wpilibj;
+
+public class MockSpeedController implements SpeedController {
+  private double m_speed;
+  private boolean m_isInverted;
+
+  @Override
+  public void set(double speed) {
+    m_speed = m_isInverted ? -speed : speed;
+  }
+
+  @Override
+  public double get() {
+    return m_speed;
+  }
+
+  @Override
+  public void setInverted(boolean isInverted) {
+    m_isInverted = isInverted;
+  }
+
+  @Override
+  public boolean getInverted() {
+    return m_isInverted;
+  }
+
+  @Override
+  public void disable() {
+    m_speed = 0;
+  }
+
+  @Override
+  public void stopMotor() {
+    disable();
+  }
+
+  @Override
+  public void pidWrite(double output) {
+    set(output);
+  }
+}